diff --git a/src/freedombone-utils-firewall b/src/freedombone-utils-firewall
index d2f28188..7ebc5a4f 100755
--- a/src/freedombone-utils-firewall
+++ b/src/freedombone-utils-firewall
@@ -126,13 +126,13 @@ function firewall_deny_forwarding {
 }
 
 function firewall_allow_forwarding {
-    curr_ipv4_address=$(get_external_ipv4_address)
+    curr_external_ipv4_address=$(get_external_ipv4_address)
     iptables -A INPUT -i ${FIREWALL_EIFACE} -m state --state NEW -p udp --dport 1194 -j ACCEPT
     iptables -A INPUT -i tun+ -j ACCEPT
     iptables -A FORWARD -i tun+ -j ACCEPT
     iptables -A FORWARD -i tun+ -o ${FIREWALL_EIFACE} -m state --state RELATED,ESTABLISHED -j ACCEPT
     iptables -A FORWARD -i ${FIREWALL_EIFACE} -o tun+ -m state --state RELATED,ESTABLISHED -j ACCEPT
-    iptables -t nat -A POSTROUTING -s ${curr_ipv4_address}/24 -o ${FIREWALL_EIFACE} -j MASQUERADE
+    iptables -t nat -A POSTROUTING -s ${curr_external_ipv4_address}/24 -o ${FIREWALL_EIFACE} -j MASQUERADE
     iptables -A OUTPUT -o tun+ -j ACCEPT
     write_config_param EXTERNAL_IPV4_ADDRESS "$curr_external_ipv4_address"
     save_firewall_settings